<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>轮播图</title>
</head>
<style>
    * {
        margin: 0;
        padding: 0;
    }

    li {
        list-style: none;
    }

    .tb-promo {
        position: relative;
        width: 520px;
        height: 280px;
        background-color: gray;
        margin: 100px auto;
    }

    .tb-promo img {
        width: 520px;
        height: 280px;
    }

    .prev {
        left: 0;
        border-top-right-radius: 15px;
        border-bottom-right-radius: 15px;
    }

    .prev, .next {
        position: absolute;
        /*绝对定位的盒子垂直居中*/
        top: 50%;
        margin-top: -15px;
        /*加了绝对定位的盒子可以直接设置高度和宽度*/
        width: 20px;
        height: 30px;
        background: rgba(0, 0, 0, .3);
        text-align: center;
        line-height: 30px;
        color: #ffffff;
        text-decoration: none;
    }

    .next {
        /*如果一个盒子既有left属性，又有right属性，则默认会执行left属性 同理，top bottom 会执行top*/
        right: 0;
        border-top-left-radius: 15px;
        border-bottom-left-radius: 15px;
    }

    .promo-nav {
        position: absolute;
        bottom: 15px;
        left: 50%;
        margin-left: -35px;
        width: 70px;
        height: 13px;
        background-color: rgba(255, 255, 255, .3);
        border-radius: 7px;
    }

    .promo-nav li {
        float: left;
        width: 8px;
        height: 8px;
        background-color: #ffffff;
        border-radius: 50%;
        margin: 3px;
    }
    /*不要忘记选择器权重的问题 */
    .promo-nav .selected {
        background-color: #ff5000;
    }



</style>
<body>
<div class="tb-promo">
    <img src="../images/fox.jpg">
    <!--左侧按钮-->
    <a href="#" class="prev">&lt;</a>
    <!--右侧按钮-->
    <a href="#" class="next">&gt;</a>
    <!--小圆点-->
    <ul class="promo-nav">
        <li class="selected"></li>
        <li></li>
        <li></li>
        <li></li>
        <li></li>
    </ul>
</div>
</body>
</html>